Evaporator



F. G. SLAGEL Aug. 22, 1933.

EVAPORATOR Original Filed Aug. 13, 1930 E5 4 gmznioo Patented Aug. 22, 1933 I EVAPORATOR Franklin G. Slagel, Buffalo, N. Y., assignor to Fedders Manufacturing Company, Inc., Buffalo, N. Y., a Corporation of New York 'Application August 13, 1930, Serial No. 475,033

Renewed January 10, 1933 8 Claims (on. 62-95) This invention relates to mechanicalrefrigerating liquids, I associate tubes and fins with the ing systems and more particularly to evaporators. header. A tube loop 21 depends from the rear An object of my invention is to provide an end of the header, and the open ends thereof are evaporator unit in which a plurality of tubes are arranged in open communication with the liquid associated to form superposed freezing chambers. refrigerant in the header so that the tube is filled Another object of the invention is to provide with. refrigerant. The header, preferably, exan evaporator consisting of a header and assotends in a horizontal plane, while the tube loop ciated tubes, there being a main vertical tube depends vertically therefrom. A series of superfrom which a plurality of horizontal tubes exposed parallel tubes 22 extend horizontally below tend to form superposed freezing chambers. the header, and their ends are secured one to each 5 A further object of my invention is to provide leg 23 of the loop 21 and in open communication a simple form of evaporator having a plurality with the refrigerant therein. Each of the tubes of superposed freezing chambers formed by an 22 are bent centrally in a reverse direction to association of tubes and fins. form an inner loop 24 so that a shelf having high Other objects of the invention will appear from thermal eificiency is thereby formed.

the following description taken in connection with The space between the header and the upper the drawing, which forms a part of the specificatube 22, and the spaces between e djacent tion, and in which; tubes 22 provide freezing chambers, each of which Fig. 1 is side elevational view of an evaporator is substantially enclosed by sleeves 25 open at one incorporating the invention; end for the insertion of pans (not shown). In Fig. 2 is an end elevational view of the same; order to lend rigidity to the tube structure and Fig. 3 is a view looking at the bottom of the to increase the thermal efficiency of the evaporaevaporator; tor, I provide vertically extending fin members 26 Fig. 4 is a fragmentary view looking at the which are fixed, by soldering or otherwise, to bottom of evaporator, in which the bottom loops the sides of the tubes 22 and the header. The so are of a modified form. sleeves are in intimate contact with the fins, the Referring now to the drawing by characters of tubes 22 and the tube 21, so that quick freezing reference, the header shown is comprised of a Within the sleeves will result. cylindrical sheet metal shell 10 having an open In Fig. 4 I have illustrated a modified form of end closed by the plate 11. An outlet tube 12 horizontal tubing, and in this instance a pair of projects into the header from the end plate and loops 30 are utilized instead of the single tubing communicates with a union 13 which is secured 22. The open ends of each pair of loops are to the plate by cap screws 14, the union being secured to one orthe other legs of the tube 21 connected with the compressor (not shown) of and in open communication with the refrigerant an evaporator-compressorcondenser refrigertherein.

ating system. Another union 15 is secured to It will be seen that the header and tube arthe end plate by .cap screws 16, and in comrangement described provides a simple multiple munication with an inlet passage 1"! extending chamber quick freezing device which serves also through the end plate. The union 15 is conto absorb heat from the air or other medium nected with a condenser (not shown) and a neepassing thereby. dle valve 18 is arranged to cooperate with a seat Although this invention has been described in to control the fiow of liquid refrigerant into the connection with certain specific embodiments the header. The needle valve is reciprocated in the principles involved are susceptible of numerous passage by an open float 19 which is pivoted at 20 other applications which will readily occur to to the end plate. As the liquid refrigerant in the persons skilled in the art, and the invention is header vaporizes it is sucked out through the therefore to be limited only as indicated by the tube 12, which extends into the float, andthe scope of the appended claims. float moves with the level of the liquid refriger- What I claim is: ant body so that as it falls the float moves the 1. In an evaporator for refrigerating systems, a valve to permit liquid refrigerant through the header adapted to contain a body of liquid reinlet passage until a predetermined body is frigerant, means for admitting refrigerant into present in the header,- whereupon the valve is the header to maintain the liquid body substanseated. tially constant, a tube depending from the header In order to increase the heat transfer area of including legs having their open ends in open the evaporator surface and to provide for freezcommunication with the liquid body, and a plurality of parallel tubes in planes beneath the header, said tubes extending laterally from said depending tube and having their endsconnected in open communication with the interior of the legs of the depending tube.

2. In ,an evaporator for refrigerating systems, a header, means foradmitt'ing refrigerant to maintain a body of liquid refrigerant in the header, a tube loop depending from one end of the header and secured thereto with its ends in open communication with the liquid body, and a plurality of parallel tubesarranged in planes beneath the header, said tubes extending laterally from said depending tube and having their ends connected in open communication with the interior of the legs of the tube loop.

3. In an evaporator for refrigerating systems, a header, means for admitting refrigerant to maintain a body of liquid refrigerant in the header, a tube loop depending from one end of the header and secured thereto with its ends in open communication with the liquid body, a plurality of parallel tubes beneath the header having their open ends connected to the legs of the tube loop and in open communication with the refrigerant therein, and a plurality of vertical fins connected to'the sides of the header and the parallel tubes.

4. In an evaporator for refrigerating systems, a horizontally extending header, a tube loop depending from the header and open to the interior thereof, horizontally extending parallel tubes beneath the header and secured in open communication with the legs of the tube loop, said parallel tubes projecting laterally from said depending tube, and means for maintaining a body of liquid refrigerant in the header and tubes.

5. In an evaporatorfor refrigerating systems, a horizontally extending header, a tube loop depending from one end of the header and open to the bottom interior thereof, horizontally extending parallel tubes beneath the header secured in open communication with the legs of the tube loop, means for maintaining a body of liquid communication with the bottom of the interior thereof, horizontally extending parallel tubes spaced beneath the header and secured with their ends in open communication with the legs of the tube loop, fins secured to the sides of the header and the horizontal tubes, and sleeves intermediate the horizontal tubes, said sleeves being in intimate contact with the tubes and fins.

'1. In an evaporator for refrigerating systems, a horizontally extending header, a' tube loop depending from one end of the header and in open communication with the bottom of the interior thereof, horizontally extending parallel spaced tubes beneath the header and secured with their ends in open communication with the legs of the tube loop, said horizontal tubes having a central portion bent to extend parallel to the end portions, and means for maintaining'a body of liquid 

